The Experimental Study of an R744 Heat Pump System for an Electric Vehicle for Cabin Cooling or Heating and Battery Fast Charging Cooling

Xilong Wang, Keke Xu, Linjie Huang, Feng Cao () and Yulong Song ()
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Xilong Wang: School of Energy and Power Engineering, Xi’an JiaoTong University, Xi’an 710049, China
Keke Xu: Hangzhou Sanhua Research Institute Co., Ltd., Hangzhou 310016, China
Linjie Huang: Hangzhou Sanhua Research Institute Co., Ltd., Hangzhou 310016, China
Feng Cao: School of Energy and Power Engineering, Xi’an JiaoTong University, Xi’an 710049, China
Yulong Song: School of Energy and Power Engineering, Xi’an JiaoTong University, Xi’an 710049, China

Energies, 2023, vol. 16, issue 4, 1-16

Abstract: In this paper, a new R744 heat pump system is studied. The gas cooler, evaporator, indoor heat core, and indoor gas cooler are all micro-channel heat exchangers. The R744 high pressure system adopts a combination of an accumulator and internal heat exchanger (ACCU/IHX). In addition, an electronic reversible regulating valve is added before the outdoor gas cooler, making the outdoor heat exchanger able to be used as a gas cooler or evaporator. The water-cooled condenser can improve the performance in the cooling or heating mode. The research contents contain the performance and optimal pressure under extreme conditions as a result of the experiments. The results show that the cooling capacity can reach 8.2 kW with a COP of 1.87, under a 40 °C external circulation intake. The cooling capacity on the battery side can reach 11 kW under an ambient temperature of 40 °C, which can provide a sufficient cooling capacity. Under an ambient temperature of −20 °C, the maximum heating capacity can reach 6.86 kW with a COP of 1.67. Under an ambient temperature of −15 °C, the heating capacity reaches 5.07 kW with a COP of 1.78, when the indoor air volume flow rate is 200 m 3 /h. Obviously, R744 heat pumps show a huge advantage, compared with the traditional PTC heating or R134a heat pumps at extremely low temperatures.

Keywords: battery fast charging cooling; CO 2 refrigerant; cooling and heating capacity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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